My jack dempsey sits on the bottom of the tank

yeah I have the same problem, I know you posted this a year ago, so im hoping you found a solution, I have a black and a albino oscar as well and I wanted to add a tankmate so I got a jack dempsey, he bickers with the other two a lil bit now and than but than hides behind my plant. I put in 15 feeders just to see what he would do just like you did but nothing, I have seen him eat one pellet so far lol but nothing else, my oscars take in everything I put in there and jack just hides at the bottom behind his plant. what did you do to get him out or did he ever? I thought of getting another jack or something to put in there as well but I don’t know. I have a 55 gallon and I dont wanna over fill it with fish, but will be upgrading my tank hopefully this year before the fish get too big, my water temp is always at about 77-78 degrees, I put in crushed coral to raise the ph, ammonia was high but is starting to go down… I just don’t know what else to do so when I saw this post when I googled answers for my jack dempsey I was pretty surprised that someone had the same problem and had the same exact fish in the tank lol … so if you get this please answer!!

I know what you mean. I had an oscar and a dempsey in a 55 gallon tank and the oscar was a big bully. Basically the jack just stayed in the side of the tank near the bottom and I also never saw him eat (unless food came directly in front of his face.) Although the tank is small I currently have my jack in a 15 gallon tank until I am able to get my another 55 gallon set up. He is much happier. He swims around a lot and gobbles all the food as soon as it hits the water. Occasionally I will put a feeder fish or 2 in there and he eats them in 2-3 minutes. Its funny b/c he will get one in his mouth immediately and chase the other one before he finishes the first. I guess to make my long story short, he might not be happy and prefer his own space.